Electron discharge device



Feb. 15, 1949. R. K. GESSFORD ELECTRON DISCHARGE DEVICE Filed June 25, 1945 a cathode ray tube.

\ i 'atente i 15 194 UNI TED" STATES "PATENT 2,461,728 g I ELECTRON DISCHARGE DEVICE Ross K. Gessford, Emporium, Pa., assignor to Sylvania Electric Products Emporium, Pa.,- acorporation of Massachusetts Application June 25, 1945, -Serial No. 601,398

'9 Claims. (o1. 2s0---159) *My' invention relatesto an electron discharge device andto a clamping or support arrangement for an element of an electron discharge device, such as a deflector plate for a cathode ray tube. a

' Electron discharge devices, such as cathode ray tubes, have usually included an electron gun supported in an envelope, which produces a beam of electrons which impinge on a screen. In orderto control the direction of flow of the beam of electrons, it is customary to provide deflection plates which usually take the form. of two pairs cathode ray tube of the type with which "my invention may beemployed.

of spaced plates, so that when a potential is properly applied to the plates, the electron beam will be made to scan the screen. Such an electron discharge device as' a cathode ray tube also usually includes supporting members such as permanently positioned in relation to the supporting columns and the electron beam, the direction of which is to be determined by the potential on the plates. It sometimes happens, however, that it is desired to change the position of the deflection plate in a particular tube con- .struction, and it is also desirable to provide a particular plate construction which may be made in large quantities and which may be employed :in different types of tubes.

Itgis, therefore, an object of my invention to provide an improved electron discharge. device with an arrangement forfsupportinga plate member in a manner which will facilitate the fabrication of the electron discharge device;

Another object of myinvention'is to provide an improved deflection plate mounting arrangement for anelectron discharge device, such as Further objects and advantages of my inven tion will become apparent from thefollowlng description referring to the accompanying drawing, and the features of novelty which characterize my invention will be: pointed out with particularity, in the claims annexed to and forming a part of this specification.

In the drawing, Fig. 1 is, a top plan view of an electron discharge device which is provided with an embodiment of my invention; Fig. 2 is a side view of the tube construction of Fig. 1; Fig. 3 is an exploded perspective view of the pair of clamp memberswhich are employed to support the deflection plates in the discharge device construction illustrated in Fig. 1 and. Fig. 2; Fig. 4 is a sectional view taken along'the lines of 44 of Fig. 2; and Fig. 5 is a diagrammatic view of an electron discharge device, such as a Referring to Fig; l and Fig. 2 of the drawing, 1' have illustrated atube mount for an electron discharge device which is particularly suitable for a cathode ray tubewhich includes a tubular portion |,1 which may be considered as the upper portion'of a conventional electron gun which is conventional to employ in such an electron discharge device. In order to support the various parts of the tube mount inspaced relation to each other, thereis provided supporting means or spaced supporting columns 2, 3, 4, and 5. Spaced plate members 6 and I are provided, on thet'periphery-of which are placed aplurality of supporting arrangements or snubbers 8 which position the end of the tube mount within an envelope 9-, which is diagrammatically illustrated in Fig.5. I

It will be understood that'a beam of electrons is provided bythe electron gun, which electrons pass through the tube I, and in order to control the path of the electron beam so that the beam may scan'a screen It, which is positioned at the end rof the envelope 9, there are provided a pair of deflection plates H and I2 which are spaced from each other and a second'pair of deflection plates axially'spaced from the first pair II and l2,one o1- said second pair of plates being identified by the numeral [3. It will be seen that the plane of the plates II "and I2 are at right angles tothe plane of the plates l3 so that the path of the: electron'beam'may be controlled in two directions.

'Inrorder to provide a supporting arrangement for the'deflection plates so that the distance between the plates may be varied for any particular tube construction andso that theposition of the be described;

' As will be seen in 3, the clamp member M has a U shaped construction or a relatively flat portion l6 with two right-angularly or depending flanges H, the purposeof which will becom'effapparentas the following description proceeds. Similarly; the clamp member 15" is substantially U-shaped and has a relatively flat portion l8 with two angularly extending flanges l9. In order to support clamp member. I4 011 a pair of spaced supporting columns 2 and 3, a relatively flat portion I6 is provided with collars 2!] through which pass the columns 2 and 3, as will=be clearly seen in Figs. 1 and 2. The collars 20, when the clamp I4 is suitably positionedwith respect to the rest of the mount,-

may be crimped so that the clamp I4 may be relatively rigidly mounted with respect to the supporting columns 2 and 3. Also, the plate II may be suitably formed or fabricatedanddurrigidly attached to the deflection plate II in any suitable manner, such as by spot welding, as is indicated by the numeral 2|.

In the fabrication of the mount of an electron discharge device as that illustrated in a drawing, when the deflection plate is suitably positioned with the remainder of the structure, the pair of clamps I4 and i5 will be nested or telescopically arranged, and the, adjacent outwardly projecting flanges, IT and I9 may be attached together in any suitable manner, such as by spot welding, as is indicated by the numeral 2 I in Fig. 4. Referring also to Fig. 2, it will be seen that the pair of clamp members. for supporting the deflection plate I3 are, arranged with the outwardly extending flanges I9 ofthe clamp I5 placed over the outer surface of the depending flanges I! of the clamp member, I4. It-will be understood that the pair of clampfmembers including the first member I4 attached to the supporting columns 2 and 3 and the second clamp member I5 which is attached to its deflection plate may be so designed that the adjacent flanges I1 and I9 fit relativelytightly together.

In view of my improved supporting arrangement for the deflection plates, the position of the deflection plates may be varied. by merely changing-the relative relationship between the cooperating flanges I1 and I9. For example, in Fig. 4 Iihave illustrated in full line the relationship of the supporting flanges with the deflection plate positioned as illustrated, and in dotted lines the deflection plate" and supporting flanges'are shown in aslightly different position, and the deflection plate'may .be relatively rigidlysupported in this position by merely spot Welding the flanges ll and [9 togetherwhen they are in the position illustrated in Fig. 4 in dotted lines.

My improved supporting arrangement-forpdeflection plates also provides a-convenient way for electrically connecting the deflection plate to an external circuit, and as will be seen in Figs. -1 and 2, a pig-tail or connecting conductor 22 is attached to the clamp members at 23 and is, in

plate member, a support, a first U,-shaped clamp member, a second U-shaped clamp member, means for attaching said first clamp member to said plate and said second clamp member to said support, said Ushaped members being relatively telescopically arranged and attached together for positioning and supporting said plate member with respect to said support;=

2. An :electron: discharge device, including means providing a beam of electrons, a deflection of said beam, a support, a flat projection secured to and extending from said support, and a flat projection extending .perpendicularly I from said 7 plate, saidprojections being joined in overlapping ing this operation the clamp I5 may be relatively face-'to-face contact. 7 3. An electron discharge device including means providing 'a beam of electrons, a deflection plate positioned generally parallel to the undeflected course of'said beam, a support, a flat member projecting 'from'said support ,andzlyingwin a plane substantiallyparallel to saidacourse, and a second flat member extending substantiallyrpera pedicularly from the rear of saidplate and. in ,a

, plane substantially parallel to said beam; said members being joined in iatie-to-face contact 7 and in any desired relative position.

.- flat spacedapart portions, and rigid conductive lap-joints between said portions lying in planes parallel to the undeflected course of saidbeam.

5. An electron beam'tube according to, claim: 4 wherein-one pair of portions embracestheother pair.

6. An electron beam tube accordingto claim4 including pairs of' deflection plates properly spaced apart by said joints.

'7. The method of 'mounting'anelectrode on-a support in an electron discharge device including the steps of providing the electrode with a flat metal extension, similarly providing said support with a flatmetal extension and conductively join-, ing said extensions in overlapping contact and many desired relative position.

8. The method of mounting adeflection plate in an electron beamtube which comprisesthe steps of providing the plate with a rearward flat extension lying in a plane parallel'to the electron beam, similarly providing a support in the. electron beam. tube with a flat metal extension lying in aplane parallel to the beam, andconductively joining said extensions in'any desired relative position to locate said plate in the proper axial, radial and angular position in relation to the undeflected course of the beam.

9. The method of mounting a generally flat plate'in an electron discharge tube comprising the -steps'of-- providing the plate with a parallel pair of flat extensions substantially at-right an: gles to the "surface of the plate, providing'a nesting pair of supporting parts, and Weld-ingsaid extensions to said supporting parts for properly orientingsaid plate.

ROSS K. GESSFORD.

REFERENCES CITED,

The following references are of record in the flle 'of this patent:

UNITED STATES PATENTS. 

